Anthracene compound.



oHewsKI, doctor of philosophy, chemist, citiquinone wit-1i UNITED STATES PATENT OFFICE.-

PAUL THOMASCHEWSKI, OF VOHWINKEL, NEAR ELBEREELD, GERMANY, ASSIGNOB T0 FARBENFABRIKEN VOBM. FRIEDR. BAYER & 00., .OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

ANTHRACENE COMPOUND.

No Drawing.

Specification of Letters Patent. Patented Nov. 2, 1909. Application filed June 29, 1} )09. Serial No. 505,035.

- aminoanthraquinone being precipitated after some t1me; soluble in concentrated sulfuric acid with a green color quickly turn- To all whom it may concern:

Be it known that 1, 'PAUL THOMAS- zen of the German Emplre, residing at Vohwinkel, near Elberfeld, Germany, have invented new and useful Improvements in Anthracene Compounds, of which the following is a specification.

This invention relates to the production of a new anthracene derivative, being chem ically the leuco compound of 1.5-dibenzoyldiaminoanthraquinone.. It is obtained bytreating 1:5 -'dibenzoyldiaminoanthra-' hydrosulfite and caustic soda v the textile fiber orange-yellow shades.

I claim:

The herein-described new anthracene derivative which is the leuco compound of 1.5- dibenzoyldiaminoanthraquinone obtainable by treatin 1.5-dibenzoyld-iaminoanthraq'uinone Wit hydrosulfite and caustic alkali, which product is in the shape of its sodium salt a slightly colored crystalline powder quicklyturning brown byfthe action of air and then yellow, soluble in water with a "violet-brown color; soluble in concentrated sulfuric acid with a green color quickly turning orange-red; furnishing 1.5-dibenzoyldiaminoanthraquinone by treatment with oxidizing agents; and dyeing the teXti-le'fiber orange-yellow shades, substantially as delye. v

20 parts of a' 10 per cent. paste of 1.5- dibenzoyldiaminoanthraquinone, 20 parts of caustic soda lye (34 B.) and 2 parts of sodium hydrosulfite (free from water)'are dissolved in 50 parts of water heated to30 t; A volet-browri solution results from W ich the leuco compound is precipitated by the scribed addition of common salt. It is in the shape In testimony whereof I have hereunto set of its sodium salt a slightly colored crystal my hand in the presence of two subscribing line powder quickly turning bfown 'by the'l witnesses. action of air and then yellow, which is the color of the 1.5 dibenzoyldiaminoanthraquinone, soluble in iwater with a violetbrown color, yellow flakes of 1.5-dibenzoyldi- PAUL THOMASOHEWSKI. [1,. a]

\Vitnesses:

OTTO Ktmm, VVILLY KLEIN.

ing orange-red. Its alkaline solution dyes 

